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LM3445MM 데이터시트(PDF) 1 Page - Texas Instruments |
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LM3445MM 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 42 page ICOLL V+ BR1 VAC TRIAC DIMMER + + 1 2 3 4 5 6 7 8 9 10 - VLED GND VCC FLTR2 ASNS FLTR1 ISNS GATE BLDR COFF DIM LM3445MM VLED- D3 C7 C9 C10 D4 D8 D9 R2 D1 Q1 C5 R5 C12 D2 D10 Q2 L2 Q3 R3 R4 C11 C4 C3 R1 U1 VBUCK LINE VOLTAGE (VAC) 95.0 90.0 85.0 80.0 75.0 80 90 100 110 120 130 140 14 Series connected LEDs 10 Series connected LEDs Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design LM3445 SNVS570M – JANUARY 2009 – REVISED NOVEMBER 2015 LM3445 TRIAC Dimmable Offline LED Driver 1 Features 3 Description The LM3445 is an adaptive constant off-time AC/DC 1 • TRIAC Dim Decoder Circuit for LED Dimming buck (step-down) constant current controller designed • Application Voltage Range 80 VAC to 277 VAC to be compatible with TRIAC dimmers. The LM3445 • Capable of Controlling LED Currents Greater provides a constant current for illuminating high Than 1 A power LEDs and includes a TRIAC dim decoder. The dim decoder allows wide range LED dimming using • Adjustable Switching Frequency standard TRIAC dimmers. The high frequency • Low Quiescent Current capable architecture allows the use of small external • Adaptive Programmable Off-Time Allows for passive components. The LM3445 includes a bleeder Constant Ripple Current circuit to ensure proper TRIAC operation by allowing current flow while the line voltage is low to enable • Thermal Shutdown proper firing of the TRIAC. A passive PFC circuit • No 120-Hz Flicker ensures good power factor by drawing current directly • Low Profile 10-Pin VSSOP Package or 14-Pin from the line for most of the cycle, and provides a SOIC constant positive voltage to the buck regulator. Additional features include thermal shutdown, current • Patented Drive Architecture limit and VCC under-voltage lockout. 2 Applications Device Information(1) • Retro Fit TRIAC Dimming PART NUMBER PACKAGE BODY SIZE (NOM) • Solid State Lighting VSSOP (10) 3.00 mm × 3.00 mm LM3445 • Industrial and Commercial Lighting SOIC (14) 3.91 mm × 8.65 mm • Residential Lighting (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical LM3445 LED Driver Application Circuit Efficiency vs Line Voltage 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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